He was invincible from the beginning of the Heaven-Covering Era.

Zhou Qing transmigrated to the world of Shrouding the Heavens, starting with an extremely powerful physique and carrying a Gate of Destiny. His own power, while not invincible, was still a dominant force.
With such a perfect start, Zhou Qing could only say, "What darkness and turmoil, what golden age? I just want to shout: 'Who dares to challenge me!'"